Enerpac RAC-Series - Manual (Page 3)

Fully hand-tighten all couplers. Loose
coupler connections will block the flow of oil
between the pump and the cylinder.
2. Remove air from the cylinder as shown
below.
Single-acting cylinders: Position the cylinder
so that the plunger is pointed down and the
cylinder lower than the pump. Fully extend
and retract the cylinder 2 or 3 times.
Double-acting cylinders: Lay the cylinder on
its side and have the couplers facing up.
Fully extend and retract the cylinder 2 or 3
times.
NOTE : Collar threads are rated for the full
capacity of the cylinder when fully engaged in
attachments.
NOTE : The use of cylinder attachments or
extensions reduces the cylinder capacity by at
least 50%.
4.0 OPERATION
Operate the hydraulic pump to advance and
retract
the cylinder. Some single-acting
cylinders are spring-return, others are load-
return. The speed of retraction is affected by
the length of the hose and other restrictions in
the line. Double-acting cylinders are powered in
both directions by the pump.
The cylinder stop ring is designed to take the
full load. However, to reduce cylinder wear, use
less than full stroke when possible.
NOTE : Manufacturer’s rating of load and stroke
are maximum safe limits. Good practice
encourages using only 80% of these ratings!
5.0 MAINTENANCE
1. Use only Enerpac oil with these cylinders.
The use of any other oil may invalidate your
warranty.
2. Use dust caps when cylinders are
disconnected from the hose. Keep entire
cylinder clean to prolong cylinder life.
3. Store cylinders upright to prevent seal
distortion.
6.0 TROUBLESHOOTING
See Troubleshooting Chart on page 4.
These cylinders should be repaired only by
Authorized Enerpac Technical Service Centers.
Single-acting cylinders are spring-loaded and
require special disassembly techniques to
prevent personal injury.
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air
air